Question juridique clé
Whether the parties agreed on the scope of the mandate and the method/amount of remuneration for investigative services.
Solution extraite
The lower court's finding of a true mutual agreement on the mandate content, hourly billing, and fee amount stood; the fee claim was proven.
Motifs extraits
The appellant failed to show arbitrariness in the evidentiary assessment. The court could rely on the parties' conduct, prior invoicing, known hourly rates, incurred expenses, and the written acknowledgment as indicia of the actual agreement.